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In short
One bad session is not a plateau. Look for a flat trend across several comparable sessions.
Check the week around the lift before you change the lift.
Change one thing and judge it over several sessions.
Make sure it is a plateau
A plateau is the same work getting no easier across several sessions. Look for no gain in reps, in load at the same effort or in control. A hard day, a missed session or a night of bad sleep does not count. An estimated max trend shows it best, as long as the sets behind it compare.
Example
Keep each lift comparable
Your log can only show a plateau if the lift stays the same from session to session. Each lift has its own things to hold constant.
- Squat. Same variation, depth, bar position and equipment. A paused squat and a competition squat are two separate records.
- Bench. Same grip, pause length, handoff and rest. A longer pause can make a better set look worse.
- Deadlift. Same stance, bar and start position. Log reset reps and touch-and-go reps apart.
Look at the week around it
Check what changed around the lift: rest between sets, a hard deadlift day moved next to squats, other hinges, new accessories or moved days. Any of these can stall a lift with no change to its own sets.
Rest first. In a controlled study of trained men, three-minute rests gave bigger squat and bench gains than one-minute rests. If your first set lands on target and later sets fall apart after short breaks, fix the rest.
More days do not cure a plateau. Another study of trained men found similar squat, bench and deadlift gains from three and six sessions a week when volume and intensity were matched.
Describe before you diagnose
Film a few ordinary working sets from the same angle. Write down what you see first, for example "my setup changed after rep two". Where the bar slowed does not name the weak muscle, and one missed rep cannot pick your fix. A coach can read a repeating issue in context.
Change one thing
- If planned jumps keep turning controlled sets into misses, use a smaller load step.
- If all the work gets done and the trend is flat, add one working set of the lift.
- Keep the competition lift in the plan. Adding several variations at once hides which one helped.
- More heavy pulling or more max attempts is not the default answer.
One eight-week study found squat strength rose more with heavier, lower-rep work than with light, high-rep work. That does not mean every set should be heavy. It means the main work should stay close to the weights you want to move.
Review several sessions
Write down the problem, the change and what a good result looks like. Then compare the next several similar sessions. Look for later sets staying near the target effort and better control, as well as heavier loads.
If all three lifts drop together, look at the whole schedule and your recovery. Check recent workload and consider a deload. Pain that persists is one for a doctor or physio.